MAINTAINERS: Switch maintenance for cc2520 driver over

Varka Bhadram has not been actively working on the driver or reviewing
patches for several years. I have been taking odd fixes in through the
wpan/ieee802154 tree. Update the MAINTAINERS file to reflect this
reality. I wanted to thank Varka for his work on the driver.

Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Link: https://lore.kernel.org/r/20230218211317.284889-1-stefan@datenfreihafen.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Stefan-Schmidt

MAINTAINERS

@@ -4807,9 +4807,9 @@ F:	net/sched/sch_etf.c
 F:	net/sched/sch_taprio.c
 
 CC2520 IEEE-802.15.4 RADIO DRIVER
-M:	Varka Bhadram <varkabhadram@gmail.com>
+M:	Stefan Schmidt <stefan@datenfreihafen.org>
 L:	linux-wpan@vger.kernel.org
-S:	Maintained
+S:	Odd Fixes
 F:	Documentation/devicetree/bindings/net/ieee802154/cc2520.txt
 F:	drivers/net/ieee802154/cc2520.c
 F:	include/linux/spi/cc2520.h